pH meter calibration solutions

[turbodiesel01]

Can you suggest some calibration solutions that could be made with things around the house to calibrate pH meters. Please forgive me if this is a repeat - I can't seem to find any info out there.
Thanks

 

[turbodiesel01]

Never mind - it was hiding right under my nose...

 

[Randy Holmes-Farley]

I presume that you found that borax article:

http://web.archive.org/web/20001102...twork.com/fish2/aqfm/2000/feb/bio/default.asp

However, it is mostly good for checking pH meter accuracy, not actually calibrating one, for which you will also need a pH 7 buffer, and may need a pH 4 or 10, depending on the design (some will allow the borax as the second point, and some demand that it actually be pH 4 or 10).

 

[Randy Holmes-Farley]

These articles may also be useful:

Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm

A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm

 

[turbodiesel01]

Thanks for the info. I have a milwaukee meter. It just one calibration dial. I presumed that i just needed a solution of a known pH. I seem to have lost the manual though.

Thanks for the help
TD1

 

[Randy Holmes-Farley]

Well, you can never accurately calibrate a pH meter with single point calibration, although I admit that some cheap meters only allow one point.

If you use a single point, make it as close to tank pH as possible, so in that case, the borax may be as good as pH 7 and better than pH 10 or 4.